9.4.1 Early Christian and Byzantine Art
Read this excellent introduction to art and early Christianity.
Read this article to grasp the importance of the legalization of Christianity by Constantine for the development of Christian art.
Watch this video for a discussion of a mosaic in the church of San Vitale in Ravenna. Make sure you understand that "Byzantine art" refers to art that bears the influence of the Byzantine Empire's Christian art style. Mosaic was one of the preferred mediums of Byzantine art. Reflect upon the formal qualities of this art form, asking why it might have been a medium of choice for Christianity in its early stages.